Methods by type

Trimming — trim / chomp / chop

Full

Remove whitespace or characters from the ends of a string.

Several methods remove characters from a string's ends: trim (and its one-sided trim-leading/trim-trailing) strip whitespace, chomp removes a trailing newline, and chop removes trailing characters.

One-sided trimming #

.trim-leading strips leading whitespace; .trim-trailing strips trailing. (.trim does both — see String methods.)

say "  hi  ".trim-leading ~ "|";
say "  hi  ".trim-trailing ~ "|";

Output

hi  |
  hi|

chomp and chop #

.chomp removes a single trailing newline (if present); .chop removes the last character (or the last n with an argument).

say "line\n".chomp;
say "hello".chop;
say "hello".chop(2);

Output

line
hell
hel

Notes #

.chomp only removes a newline, and only one — it's the right tool for cleaning a line read from input, where .trim might strip meaningful spaces.
.chop removes characters regardless of what they are; .chop(n) removes n.
All of these return a new string; the original is unchanged (use .=chomp etc. to mutate in place).